//
// Encog(tm) Core v3.2 - .Net Version
// http://www.heatonresearch.com/encog/
//
// Copyright 2008-2013 Heaton Research, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//   
// For more information on Heaton Research copyrights, licenses 
// and trademarks visit:
// http://www.heatonresearch.com/copyright
//
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Encog.ML.Data.Dynamic
{
	/// <summary>
	/// Used for the input parameters to the sliding window dataset.
	/// </summary>
	public class FuncMLDataProvider: IDynamicMLDataProvider
	{
		Func<int, int, double> _handler;

		/// <summary>
		/// Constructor.
		/// </summary>
		/// <param name="handler">A method that takes as input the input/ideal sample and offset into that sample and returns the value at that location.</param>
		/// <param name="count">Total number of elements in this dataset.</param>
		/// <param name="size">The number of items per sample. eg. size of the input/output layer.</param>
		public FuncMLDataProvider(Func<int, int, double> handler, int count, int size)
		{
			if(handler == null) throw new ArgumentNullException("handler");
			if(count < 1) throw new ArgumentException("Value is too small.", "count");
			if(size < 1) throw new ArgumentException("Value is too small.", "size");
			
			_handler = handler;
			Count = count;
			Size = size;
		}

		public int Count
		{
			get;
			protected set;
		}

		public int Size
		{
			get;
			protected set;
		}

		public double this[int chunk, int index]
		{
			get { return _handler.Invoke(chunk, index); }
		}
	}
}
